diff --git a/lib/libutil/login.conf.5 b/lib/libutil/login.conf.5
index 37580b6f5700..6c44a2a604be 100644
--- a/lib/libutil/login.conf.5
+++ b/lib/libutil/login.conf.5
@@ -86,6 +86,9 @@ although type numeric is depreciated in favour of the string format and
 either form is accepted for a numeric datum.
 Values fall into the following categories:
 .Bl -tag -width "program"
+.It bool
+If the name is present, then the boolean value is true; otherwise, it is
+false
 .It file
 Path name to a data file
 .It program